David, _________ his father, _________ playing football.

There is something wrong with my watch, will you ___ ? —Let e see.

the environment of fiercecompetition, the only way John could imagine _______ stress was to get tougherby making greater efforts

John hadn’t been able to quit smoking at once; he had to control his smoking desire

Would you like to tell me about the travel —Great. I really experienced ________.